Internal Magnet Electronic Toy Speaker Amplifier 3W 4 Ohm 40mm 4Pcs Product Name : Magnet Speaker;Power : 3W Resistance : 4 Ohm;Type : Internal Magnet Shape : Round;Magnet Diameter : 18 x 5mm/ 0.71" x 0.2"(D*T) Total Size : 40 x 18mm/ 1.6" x0.71"(D*H);Material : Aluminum, Metal, Plastic Weight : 64g;Package Content : 4Pcs x Internal Magnet Speaker